Comp 4 Flashcards
1
Q
- What is the minimum furnace temperature that must be reached during start up before waste material can be introduced into an incinator?
A. 2000 deg C
B. 2500 deg C
C. 1500 deg C
D. 850 deg C
A
D. 850 deg C
2
Q
- Which type of corrosion in the boiler, caused byvthe action of steong aodium hydroxide on ateel is under stress?
A. Caustic Cracking
B. Pitting Corrosion
C. Fatige Corrosion
D. General Wastage
A
A. Caustic Cracking
3
Q
- If the running suction pressure for an operating refrigeration compressor of a TXV controlled refrigeration system is below normal, the cause maybe which of the following?
A. A fouled compressor suction strainer
B. An excess of liquid refrigerant
C. Insufficient condensing medium flow
D. The expansion valve overfeeding
A
A. A fouled compressor suction strainer
4
Q
- One advantage of dry cylinder liners used in a diesel engine is the:
A. Greater wear resistance than we liners.
B. Absence of water seal rings.
C. Lower thermal expansion rate over wet liners.
D. Greater heat transfer rate than wet liners.
A
B. Absence of water seal rings.
5
Q
- Which of the following is true about the Intercooled Recuperated (ICR) cycle of the gas turbine engine?
A. Uses external heat source to increase the temperature of the combustor inlet.
B. Uses exhaust gas to heat the combustor inlet.
C. Has an efficiency of around 25% at teir rated power.
D. Uses exhaust gas to heat the compressor inlet.
A
B. Uses exhaust gas to heat the combustor inlet.
6
Q
- In 2-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the:
A. Valve bridge
B. Valve adjusting gear
C. Pressure of the fresh air charge
D. Any 2 pressures measured with respect to a common reference
A
C. Pressure of the fresh air charge
7
Q
- The presence of bubbles in a refrigeration system liquid line may ______.
A. Be absorbed in the receiver.
B. Cause low condensing pressure.
C. Promote refrigerant dehydration.
D. Carry moisture and lead to corrosion.
A
D. Carry moisture and lead to corrosion.
8
Q
- The temparature control for a hot water system is very erratic with the temperature gradually rising and then suddenly falling and vice versa even though system demand is fairly constant. Which of the options given is the most likely cause of this?
A. Control valve actuator diaphragm.
B. Controller integral action reset time is too fast.
C. Set the proportional action first.
D. Set the integral action first.
A
C. Set the proportional action first.
9
Q
- Small cracks in the crankshaft bearing surface of a diesel engine are an indicator of:
A. Misalignment
B. Insufficient lubrication
C. Increasing effective force
D. Fatigue failure
A
D. Fatigue failure
10
Q
- During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when all the boxes are actively cooled, the compressor lube oil should be ______?
A. The highest
B. At its mid-range
C. Of no consequence as the lube oil is not used in the operation od the unloader
D. The lowest
A
A. The highest
11
Q
- One of the routine tasks onboard maintenance for Gas Turbine is mainly of daily visual checks of the running engine. What are you going to execute after a fix number of operating hours to remove any salt deposits on the compressor?
A. External grain washing
B. Internal grain washing
C. Internal water wash
D. External water wash
A
C. Internal water wash
12
Q
- Which of the listed component is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?
A. The condenser and the solenoid valve.
B. The compressor and the expansion valve.
C. The king valve and the solenoid valve.
D. The condenser and the expansion valve.
A
B. The compressor and the expansion valve.
